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- W2059201301 abstract "The detection of heavy metal ions – Hg2+, Pb2+, Cd2+ – by a free base porphyrin, 5,10,15,20-tetra(4-N-methylpyridyl)porphyrin (TMPyP), was studied. The porphyrin was either adsorbed in sol–gel matrix (TMOS) or grafted on glass surfaces. Detection limit was 10−7 mol/l for mercury and cadmium, and 10−5 mol/l for lead. Apparent association constants were calculated at pH=7: pK (Cd2+)=−5.2; pK (Pb2+)=−4; and at pH=4 pK (Hg2+)=−5.7. Both the shift of the Soret band and the change in fluorescence lifetime enabled the identification of the metal ions. In sol–gel, detection limits were found to be 10−3 mol/l but 90% of the metal salts were trapped by the matrix. In sol–gel we have shown that the ions were pumped by the matrix at a concentration of 1.5×10−5 mol/ml of sol–gel. The sol–gel limits both the reaction time and the detection threshold. No such effect is observed for grafted monolayers. A reaction time of 30 min and a detection limit of 10−6 mol/l were measured for Hg2+ salts." @default.
- W2059201301 created "2016-06-24" @default.
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- W2059201301 date "1999-06-01" @default.
- W2059201301 modified "2023-09-26" @default.
- W2059201301 title "Heavy metal ions detection in solution, in sol–gel and with grafted porphyrin monolayers" @default.
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- W2059201301 doi "https://doi.org/10.1016/s1010-6030(99)00046-5" @default.
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